This monograph describes advances in the theory of extremal
problems in classes of functions defined by a majorizing modulus of
continuity w. In particular, an extensive account is given of
structural, limiting, and extremal properties of perfect w-splines
generalizing standard polynomial perfect splines in the theory of
Sobolev classes. In this context special attention is paid to the
qualitative description of Chebyshev w-splines and w-polynomials
associated with the Kolmogorov problem of n-widths and sharp
additive inequalities between the norms of intermediate derivatives
in functional classes with a bounding modulus of continuity. Since,
as a rule, the techniques of the theory of Sobolev classes are
inapplicable in such classes, novel geometrical methods are
developed based on entirely new ideas. The book can be used
profitably by pure or applied scientists looking for mathematical
approaches to the solution of practical problems for which standard
methods do not work. The scope of problems treated in the
monograph, ranging from the maximization of integral functionals,
characterization of the structure of equimeasurable functions,
construction of Chebyshev splines through applications of fixed
point theorems to the solution of integral equations related to the
classical Euler equation, appeals to mathematicians specializing in
approximation theory, functional and convex analysis, optimization,
topology, and integral equations
.
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